Gage-cock.



M. WRIGHT.

. GAGE 000K.

APPLICATION FILED APR. 24, 1913.

' Patented Sept. 22, 1914.

IVJTNESSES:

. UNITED STATES PATENT onnion.

MALCOLM WEIGHT, or 'm srnisune, MARYLAND.

H To all whom it may concern v A further object of GAGE-COCK.

, Specification of Letters Patent.

Patented Sept. 22, 1914.

Be it known that I, MALCOLM Wnrcnr, a citizen of the United States, residing at Raspeburg, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Gage- Cocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

This invention relates to improvements on gage cocks or try-cocks, such as are 'used commonly upon steam boilers for the purpose of testing the amount of water in a oiler, and an object of the'invention is to provide such a gage cock with a stem which will effectively prevent Wire drawing, and cutting of valve seats by the passage of steam.

the inventionis to provide a gage cock with anintermediate chamber between the boiler pressure and the exhaust, this intermediate chamber being connected in certain positions of the cock with the boiler and exhaust at the same time.

A still further object of the invention is to provide a gage cock with a reciprocating stem adapted to have a plurality of bearings' so that if steam should accidentally pass one or two of the bearin s, it will be caught by the third hearing, so that escape of steam is effectively prevented,'while the "stem is provided with means for positively preventing escape of steamwhen the gage cock is in closed position.

With these and other objects in view, the invention consists in certain novel constructions, combinations and arrangements of the parts which will'be hereinafter fully de- In the drawings: Figure 1 is a side elevation of the gage cock in' closed position, the operating portion being shown in sectionto disclose the stem andintermediate steam chamben. Fig. 2 is a view similar to Fig. 1 with the gage cock shown in open position, the gage cock being indicated as connected to a boiler the walls of which are diagrammatically indicated.

In general, this invention aims to provide a gage cock the body of which is providedwith a' ni ple adapted to be inserted in any approve mannerin a'boiler, while there is provklgl in the body of the gage cook a continuous bore forming guides for a stem and fitting snugly with the stem, this gore being enlarged to form a steam chamer. The stem is provided with two non-communicating bores, one of which is adapted to connect the steam chamber with the boiler when. the gage cock is in open position, while at the same time the second bore will connect the steam chamber with an exhaust nozzle, which is carried by the outer end of the stem. Additional packing may be used to catch any steam which may pass between the stem and the'bore formed in the body of the gage cock, this packing being held in place by any suitable housing.

Corresponding and like parts are referred toin the following description and indicated in both views of the drawings by the same reference characters.

Referring to the drawings, it will be seen that the body of'the gage cock 1 has extending therefrom an arm 2 which carries a pin 3, which forms a fulcrum for a bell crank 4:, the lower end of which is slotted as at 5, to receive a pin 6 rigidly mounted in the nozzle-carrying block 7. The upper arm of the bell crank 4 may be connected with any suitable actuating means not shown, and also receives under the lower edge thereof one end of a spring 8, which is looped around the extending end of the pin 3, and seated as at 9, in the arm 2 of the gage cock. This is shown as one means of actuating the gage cock and no claim is laid to this particular arrangement. Any means may be employed for limiting the inward movement of the stem 13, the means shown in the drawings comprising a slot 2 formed in the arm 2 which is adapted to engage the lower arm of the bell crank lever 4 whenthe stem has reached the limit of its inward movement.

The body of the gage cock has a threaded nipple 10 extending therefrom, the threads being tapered if desired, and adapted to have a steam tight connection with the boiler, the walls of which are indicated diagrammatically at B in Fig. '2. The inner end of the nipple 10 has passing therethrough a bore 11, while the outer end of the body of the gage cock has a second bore 12, these bores 11 and 12 being in alinemcnt and of the same diameter, or other appropriate cross section. The stem 13 of the gage cock; which'may be cylindrical or of any other geometrical form to conform to the bores 11 and 12, is adapted to pass through said bores and has formed on the inner end thereof, a valve head 14, this valve head 14 being so positioned and proportioned as to [form a close contact with valve seat 15 formed on the inner end of the nipple just outside of the bore 11 when the gage cock is in the position shown in Fig. 1, that is, closed position. The body of the gage cock is provided with an internal steam chamber 16, this chamber being located between and axially alined in the bores Hand 12, and beingsufiiciently large to accommodate an appreciable quantity of steam or water.

There is provided at the inner end of the stem 13, a bore 17 which has two lateral outlets, the outlet 18 being removed somewhat from the inner end of the stem, where.

as the outlet 19 is somewhat farther forward. This bore 17 extends only between the outlets 18 and 19, and does not continue to the end of the stemv 13. There is also provided a second bore 20, formed in the outer end of the stem 13, this bore having a lateral outlet 21 positioned as shown in the drawings and described hereinafter, while the second outlet 22 is formed by having the bore pass through the outer end of the stem 13. The outer end of this stem may be threaded or otherwise secured to the nozzlecarrying block 7, this block 7 being provided with a cavity 23, communicating with the bore of a nozzle 24 so that there may be a complete ,passage from the opening 21 through the bore 20 out of the outlet 22 into-the chamber or cavity 23, and through the nozzle 24;. In order to prevent leakage, the body is provided with threads 25 adapted to receive a gland nut 26 which holds in place suitable packing 27 surrounding the stem.

As shown in Fig. 1, it will not be possible for steam to pass from the boiler into the chamber 16, insomuch as the bore 11 is completelyfilled by the stem 13, this stem 13 being of such diameter as to fit snugly but slidably in the bores 11 and 12. Also, the valve head 14: is tight against the valve seat 15 so that there is no way for steam to pass into the chamber 16. I do not wish to be limited to a particular formation of the valve head 14, but I wish merely to have said head sufficiently tight against the seat 15 to prevent passage of steam. It will also be noted in this position, that there is-no communication between the chamber 16 and the exhaust insomuch as there is no passage connecting the bore 17 with the bore 20, and the outlet 19 is in no way exposed.

When the bell crank l is moved downwardly to a position as shown in Fig. 2, this downward movement'of the bell crank being made when. it is desired to determine the amount of water in the boiler, it will be seen that by reason of the slot 5 and pin '6, the

nozzle-carrying block 7 and the stem 13 which is rigid therewith, would be moved inwardly until the lower arm of the bell crank lever t engages the bottom of the slot 2'. The innermost position of the gage cock and I,

her 16. The opening 21 is so placed in the stem 13 that as the stem assumes its innermost position, said opening will be within the chamber, so that steam may pass from the chamber 16 through'the opening 21 and out of the exhaust nozzle if the water in the boiler is below the gage cock, steam will be exhausted as described, whereas if the water in the boiler is above the gage cock, water will pass into the chamber 16,

but will require an appreciable time to fill the cavity 16. It will be noted however, that as soon as the opening 18 is exposed to the water pressure, water will pass through the opening 19 into the chamber, but it will be further noted that the opening 21 is not in communication with the chamber 16 -until the gage cock has assumed its innermost position. During the interval or" time elapsing between the passage of the opening 18 be yond the bore 11, and the entrance of the opening 21 into the chamber 16, sufficient time will have elapsed to allow the Water to partly or completely fill the chamber 16 and pass out of the nozzle exhaust 2a. By referring to Fig. 2, it will be seen that the distance between the openings 19 and 21, is just a little less than the length of the steam or water chamber 16, but I do not wish to be limited to this particular construction, insomuch as the same result may be obtained by varying the distance between said openings, but it is desirable that the opening 19 be within the chamber 16 when the valve is closed as shown in Fig. 1, so that by no means will it be possible for any steam which is trapped in the chamber 16 to pass through the bore 12.

It" will beevident from followin the course of the water and steam through the gage cock, that at no time does the steam pass over a hearing or a valve seat, so that no wearing surface is at any time in contact with the steam or water so that the effects of wire drawing are completely removed in the present construction. The normal construction of the stem is to have as great a distance as possible between the openings 19 and 21, so as to require a minimum movement of the stem in order to carry the opening 21 beyond the nut 26, insomuch as it is desirable to have the opening 21 removed from the packing chamber inclosed Within the nut 26. By having the bore 17 and its outlets completely inclosed within the chamber 16, and by having the opening'21 out- (side hf the nut 26, it will be seen that when fthe" gage cock is closed, escaping steam would have to pass between the valve head do not wish to be limited to any particular form of nozzle which may be used to exhaust the steam after the steam has once entered the opening 21, nor do I wish to be limited to the use of the valve head 14, and the seat 15.

Having thus described the invention, what is claimed is:

1. In a gage cock, the combination with a "body having alined bores and a chamber axially alined with but larger than said bores and connecting their adjacent ends, the inlet end of the inner bore having a valve seat, and a gland nut and packing around the outlet end of the outer bore; of a stem slidably mounted throu h said bores and packing and passing .t rough said chamber than which it is appreciably smaller, a valve at the inner end of the stem, the stem having near its inner end a bore with lateral openings at its extremities spaced apart a less distance than the length of said chamber and both opening into it when said valve is seated, and said stem also having a second bore with a lateral inlet opening spaced from the outlet opening of the first bore a less distance than the length of said chamber and its outlet being through the outer end of" the stem, and means for moving the stem longitudinally for the purpose set forth.

2. In a gage cock, the combination with a body having alined bores and a chamber axially alined with but larger than said bores and connecting their adjacent ends, and a gland nut and packing around the outlet end of the outer bore; of a stem ,slidably mounted through said bores and packing and passing through said chamber than which it is appreciably smaller, the stem having near its inner end a bore with lateral openings at its extremities spaced apart a less distance than the length 0 said chamber and said stem also having a second bore with a'lateral inlet opening spaced from the outlet opening of the first borea less distance than the length of said chamber and its outlet being through the outer end of the stem, and means for moving the stem longi tudinally for the purpose set forth.

3.- In a age cock, the combination with a body having alined bores and a chamber axially alined with but larger than said bores and connecting their adjacent ends, and a gland nut and acking around the outlet end of the outer ore of a stem slidably mounted through said bores and packing and passing through said chamber than which it is appreciably smaller, the stem having near its inner end a bore with lateral openings at its extremities spaced apart a less distance than the length of said cham-., her, and said stem also having a second bore with a lateral inlet opening spaced from the outlet opening of the first bore a less distance than the length of said chamber and its outlet being through the outer end of the MALCOLM WRIGHT.

Witnesses:

EDWIN K. GoN'rRUM, ,JOHN'B. GONTRUM. 

